An entropy regularization method applied to the identification of wave distribution function for an ELF hiss event - Modelisation Systemes Langages Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research Année : 2006

An entropy regularization method applied to the identification of wave distribution function for an ELF hiss event

Résumé

An entropy regularization algorithm (ERA) has been developed to compute the waveenergy density from electromagnetic field measurements. It is based on the wave distribution function (WDF) concept. To assess its suitability and efficiency, the algorithm is applied to experimental data that has already been analyzed using other inversion techniques. The FREJA satellite data that is used consists of six spectral matrices corresponding to six time-frequency points of an ELF hiss-event spectrogram. The WDF analysis is performed on these six points and the results are compared with those obtained previously. A statistical stability analysis confirms the stability of the solutions. The WDF computation is fast and without any prespecified parameters. The regularization parameter has been chosen in accordance with the Morozov's discrepancy principle. The Generalized Cross Validation and L-curve criterions are then tentatively used to provide a fully datadriven method. However, these criterions fail to determine a suitable value of the regularization parameter. Although the entropy regularization leads to solutions that agree fairly well with those already published, some differences are observed, and these are discussed in detail. The main advantage of the ERA is to return the WDF that exhibits the largest entropy and to avoid the use of a priori models, which sometimes seem to be more accurate but without any justification.
Fichier principal
Vignette du fichier
2005JA011006.pdf (1.96 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03037603 , version 1 (03-12-2020)

Identifiants

Citer

Olivier Prot, Ondřej Santolík, Jean-Gabriel Trotignon, Hervé Deferaudy. An entropy regularization method applied to the identification of wave distribution function for an ELF hiss event. Journal of Geophysical Research, 2006, 111 (A6), ⟨10.1029/2005JA011006⟩. ⟨insu-03037603⟩
80 Consultations
68 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More